# CVE-2021-40495: Denial of service in SAP NetWeaver AS ABAP and ABAP Platform

> An unauthorized attacker can degrade performance of SAP NetWeaver Application Server ABAP via a public service, causing denial of service.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-c7v9-3364-rhjg

## What is CVE-2021-40495?

CVE-2021-40495 is a medium-severity denial of service vulnerability in Sap Netweaver Application Server Abap, published on 12 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There are multiple Denial-of Service vulnerabilities in SAP NetWeaver Application Server for ABAP and ABAP Platform - versions 740, 750, 751, 752, 753, 754, 755. An unauthorized attacker can use the public SICF service /sap/public/bc/abap to reduce the performance of SAP NetWeaver Application Server ABAP and ABAP Platform.

## Which versions are affected by CVE-2021-40495?

It affects 2 products.


Products: Sap Netweaver Abap, Sap Netweaver Application Server Abap.

## How do I fix CVE-2021-40495?

No fix has been published for CVE-2021-40495 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-40495 being exploited?

There is no known exploitation of CVE-2021-40495 in the wild and no public exploit code.

## Other vulnerabilities in Sap Netweaver Application Server Abap

- [CVE-2012-4341](https://insights.sbomify.com/CVE-2012-4341/): Memory corruption in n/a (critical 10.0)
- [CVE-2021-27610](https://insights.sbomify.com/CVE-2021-27610/): Auth bypass in SAP NetWeaver AS ABAP and ABAP Platform (critical 9.0)
- [CVE-2021-38178](https://insights.sbomify.com/CVE-2021-38178/): Business logic in SAP NetWeaver AS ABAP and ABAP Platform (high 8.8)
- [CVE-2022-22543](https://insights.sbomify.com/CVE-2022-22543/): Denial of service in SAP NetWeaver Application Server for ABAP (Kernel) and ABAP Platform (Kernel) (high 7.5)
- [CVE-2021-38181](https://insights.sbomify.com/CVE-2021-38181/): Denial of service in SAP NetWeaver AS ABAP and ABAP Platform (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40495 and fix it if it is affected.

What it is: CVE-2021-40495 is a medium-severity denial of service vulnerability in Sap Netweaver Application Server Abap, published on 12 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-40495 in the wild and no public exploit code.

Affected product: Sap Netweaver Application Server Abap. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-40495/ (Markdown: https://insights.sbomify.com/CVE-2021-40495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40495
- OSV: https://osv.dev/vulnerability/CVE-2021-40495

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-40495/
Summaries are generated and may contain mistakes; the official description above is the record.